I have an 02 Lennox gas furnace 2 stage. I recently installed a ecobee tstat. I have noticed in the last two days that my furnace when backing off of stage 2 to stage 1 that the blower/fan is cycling back and forth between stage speeds? Then finally going to the lower speed and shutting down. Is this a control board issue or is my tstat not working right? Had a tech out this weekend and after an hour of him looking around he seems to be puzzled and now wants to replace the board. Looking for insight. Could the tstat cause this? Or is it the board or something else.
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